[xwiki-users] theoretical question about a data model

Hi all, I am afraid the title of this thread is a bit pompous :-) In fact the question seems to me to be an entry level object oriented database design, but I am not able to make my mind about this. Your help will be greatly appreciated! Here a simple chart about the problem: http://mire.environmentalchange.net/~webmaster/pdr/dataModelpdR.png I have two ever-growing pools of data: providers and fishes. By following the ToDo and FAQ tutorials, I "easily" could create and instantiate the two classes but, how could I establish the relationship between providers and fishes? Thanks! Ricardo -- Ricardo Rodríguez Your EPEC Network ICT Team